Digital broadcasting signal transmitting method and device, recording medium thereof, and receiving device thereof

ABSTRACT

In a digital broadcasting signal transmission system, a transmission frame includes a frame body and a frame header, and the frame body is divided into a plurality of sub-bands in the frequency domain and is divided into a plurality of symbols in the time domain. The frame header is provided in the former part of the transmission frame and is transmitted with a signal in the time domain. The frame body includes a plurality of services, and the services respectively receive at least one sub-band and at least one symbol. The frame header includes information on the plurality of services, and information on the plurality of services includes information on the sub-band and the symbol to which the services are allocated, information on channel encoding levels of the services, and information on digital modulation levels of the services.

TECHNICAL FIELD

The present invention relates to a digital broadcasting signaltransmitting method and device, a recording medium thereof, and areceiving device thereof. Particularly, the present invention relates toa method and device for transmitting digital broadcasting signals fortransmitting a plurality of services that are multiplexed in the timedomain and the frequency domain to a transmission frame in differenttransmission formats, a recording medium thereof, and a receiving devicethereof.

This work was supported by the IT R&D program of MIC/IITA[2006-S-016-02, Development of Distributed Translator Technology forTerrestrial DTV].

BACKGROUND ART

A general digital broadcasting transmission system provides varioustransmission formats since it can select various transmission modes,modulation levels, layer modulation, and error correction codes. In thisinstance, since a transmission mode, a modulation level, layermodulation, and error correction codes can be selected for a randomradio frequency (RF) channel, a different mode, a modulation level,layer modulation, and error correction codes can be selected dependingon the RF channel.

However, since all the transmission frames that are transmitted througha random RF channel commonly use the transmission mode, modulationlevel, layer modulation, and error correction codes that are determinedaccording to the corresponding RF channel, the transmission frames ofthe corresponding RF channel problematically have transmission formatsthat are the same with respect to time.

The above information disclosed in this Background section is only forenhancement of understanding of the background of the invention andtherefore it may contain information that does not form the prior artthat is already known in this country to a person of ordinary skill inthe art.

DISCLOSURE OF INVENTION Technical Problem

The present invention has been made in an effort to provide a method anddevice for transmitting digital broadcasting signals for providingdifferent transmission formats according to the frequency domain and thetime domain, a recording medium, and a receiving device thereof.

Technical Solution

An exemplary embodiment of the present invention provides a broadcastingsignal transmission method for providing a plurality of services byoutputting a frame including: allocating at least one sub-band of theframe to the plurality of services; allocating at least one symbolsection of the frame to the plurality of services; converting the frameinto a frame in the time domain; generating a frame header in the timedomain including information on the plurality of services; and insertingthe frame header into the frame in the time domain.

Information on the plurality of services includes information on thesub-band and symbol section allocated to the plurality of services. Themethod further includes channel encoding the plurality of services, andinformation on the plurality of services further includes information onthe respective channel encoding levels of the plurality of services.

The method further includes performing digital modulation on theplurality of services, and information on the plurality of servicesfurther includes information on the respective modulation levels of theplurality of services.

Another embodiment of the present invention provides a computer readablerecording medium for recording a program for realizing the broadcastingsignal transmission method in a computer.

Yet another embodiment of the present invention provides a broadcastingsignal transmitting device for providing a plurality of services byoutputting a frame including: an allocator for allocating at least onesub-band of the frame and at least one symbol section of the framecorresponding to the plurality of services; an inverse fast Fouriertransform unit for converting the frame into a frame in the time domain;and a frame generator for generating a frame header in the time domainincluding information on the plurality of services, and inserting theframe header into the frame in the time domain.

Information on the plurality of services includes information on thesub-band and the symbol section of the frame to which the services areallocated. The device further includes: a plurality of channel encoderscorresponding to the plurality of services and channel encoding thecorresponding services; and a digital modulator corresponding to theplurality of services and performing digital modulation on thecorresponding channel encoded services, and information on the pluralityof services further includes information on the channel encoding levelsof the plurality of services and on the modulation levels of theplurality of services.

According to an embodiment of the present invention, a broadcastingsignal receiving device for receiving a frame from the outside andproviding a plurality of services includes: a frame header determinerfor determining whether to receive the frame according to a frame headerof the frame; a fast Fourier transform unit for converting the framedetermined allowable by the frame header determiner in the time domaininto a frame in the frequency domain; a service selector for outputtingat least one service of the frame in the frequency domain; a pluralityof digital demodulators for performing digital demodulation on the atleast one service; and a plurality of channel decoders for channeldecoding the digitally demodulated at least one service.

The service selector senses the location of the at least one servicefrom the frame header and outputs the at least one service. The digitaldemodulator senses information on the digital modulation level of the atleast one service from the frame header, and performs digitaldemodulation on the at least one service. The channel decoder sensesinformation on the channel encoding level of the at least one servicefrom the frame header, and channel decodes the at least one service.

ADVANTAGEOUS EFFECTS

According to the present invention, a plurality of services can bemultiplexed to the transmission frame in the frequency domain and thetime domain, and the plurality of services can be transmitted indifferent formats. Also, a receiving device can selectively receive adesired service by using a frame header including information on eachservice.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows a transmission frame configuration of a digitalbroadcasting signal transmission method according to an exemplaryembodiment of the present invention.

FIG. 2 shows a transmission frame according to an exemplary embodimentof the present invention.

FIG. 3 shows a block diagram of a digital broadcasting signaltransmitting device according to an exemplary embodiment of the presentinvention.

FIG. 4 shows a flowchart of a digital broadcasting signal transmittingmethod according to an exemplary embodiment of the present invention.

FIG. 5 shows a block diagram of a digital broadcasting signal receivingdevice according to an exemplary embodiment of the present invention.

FIG. 6 shows a flowchart of a digital broadcasting signal receivingmethod according to an exemplary embodiment of the present invention.

MODE FOR THE INVENTION

In the following detailed description, only certain exemplaryembodiments of the present invention have been shown and described,simply by way of illustration. As those skilled in the art wouldrealize, the described embodiments may be modified in various differentways, all without departing from the spirit or scope of the presentinvention. Accordingly, the drawings and description are to be regardedas illustrative in nature and not restrictive. Like reference numeralsdesignate like elements throughout the specification.

Throughout the specification, unless explicitly described to thecontrary, the word “comprise”, and variations such as “comprises” and“comprising”, will be understood to imply the inclusion of statedelements but not the exclusion of any other elements. In addition, theterms “-er”, “-or”, and “module” described in the specification meanunits for processing at least one function and operation and can beimplemented by hardware components or software components, andcombinations thereof.

A digital broadcasting signal transmitting method and device, arecording medium, and a receiving device according to an exemplaryembodiment of the present invention will now be described.

FIG. 1 shows a transmission frame configuration of a digitalbroadcasting signal transmission method according to an exemplaryembodiment of the present invention.

As shown in FIG. 1, the transmission frame includes a frame header and aframe body.

The frame header is provided on the former part of the transmissionframe, and includes information for indicating synchronization of thetransmission frame, and information (hereinafter, service information)on the plurality of services multiplexed to the frame body. In thisinstance, the service information includes information on a transmissionmode, a modulation level, layer modulation, and an error correctioncode. Also, the frame header is transmitted with a signal in the timedomain so that a receiving device may quickly check information on theframe header.

The frame body is configured with a plurality of services to betransmitted through the transmission frame, it is divided into Korthogonal frequency division multiplex (OFDM) symbols (referred to assymbols hereinafter, i.e., shown as symbol 1, symbol 2, symbol 3, . . ., symbol K in FIG. 1) in the time domain, and it is divided into Nsub-bands (shown as sub-band 1, sub-band 2, sub-band 3, . . . , sub-bandN in FIG. 1) in the frequency domain. The plurality of services arerespectively multiplexed in the time domain and the frequency domain bythe K symbols and the N sub-bands. Also, the frame body that is dividedinto K symbols is transmitted with a signal in the frequency domain.

FIG. 2 shows a transmission frame according to an exemplary embodimentof the present invention. It is assumed in FIG. 2 that the frame body ofthe transmission frames TF1 and TF2 is divided into N sub-bands in thefrequency domain and the same is divided into K symbols in the timedomain.

FIG. 2 shows a first service S1, a second service S2, a third serviceS3, a fourth service S4, and a fifth service S5 that are multiplexed tothe first transmission frame TF 1 and the second transmission frame TF2. Here, the first service S1, the second service S2, the third serviceS3, the fourth service S4, and the fifth service S5 represent contentsin different formats for digital broadcasting. The amount of datatransmission required for the plurality of services (S1-S5) depends onthe service types. Also, the transmission mode, modulation level, layermodulation, and error correction code for the respective services areindividually determined in order to apply the services to the receivingdevice with various structures.

First, the services (S1-S5) are multiplexed for the respectivetransmission frame by using size information of the services. That is,the first service S1 to the fourth service S4 are allocated to the firsttransmission frame TF1, and the fifth service S5 is allocated to thesecond transmission frame TF2.

As shown in FIG. 2, the frame body of the first transmission frame TF1is divided into a first sub-band group, a second sub-band group, and athird sub-band group. In this instance, the first service S1 isallocated to the first sub-band group, the second service S2 isallocated to the second sub-band group, and the third service S3 and thefourth service S4 are allocated to the third sub-band group. The firstsub-band group and the second sub-band group are located on the Ksymbols, and K symbols are divided into two parts in the third sub-bandgroup so that the first part is allocated to the third service S3 andthe second part is allocated to the fourth service S4.

That is, in the frame body of the first transmission frame TF1, thefirst service S1 is allocated to A sub-bands and K symbols, and thesecond service S2 is allocated to B sub-bands and K symbols. The thirdservice S3 is allocated to C sub-bands and X symbols, and the fourthservice S4 is allocated to C sub-bands and Y symbols. In this instance,the sum of A, B, and C (i.e., A+B+C) is the number N of the entiresub-bands, and the sum of X and Y (i.e., X+Y) is the number K of theentire symbols.

The first service S1 to the fourth service S4, which are low-capacitycontents, are multiplexed in the time domain and the frequency domainand can be transmitted with a single transmission frame.

The second transmission frame TF2 and the fifth service S5, which arelarge-capacity contents, can be multiplexed to a single transmissionframe TF2.

In this instance, the first service to the fourth service can below-capacity contents that can be provided to a cellular phone, and thefifth service can be large-capacity contents that can be provided to ahigh definition (HD) television.

As described, according to the digital broadcasting signal transmissionmethod according to the exemplary embodiment of the present invention, aplurality of different services with a low capacity can be multiplexedin the frequency domain and the time domain to be thus configured to asingle transmission frame. Further, a single service with a highcapacity can be configured to a single transmission frame.

In this instance, the transmission frame includes a frame headerprovided to the former part, and the frame header includes informationon a plurality of services. Here, information on the plurality ofservices includes information on at least one sub-band and at least onesymbol at which the plurality of services are located. Since the frameheader is transmitted with the signal in the time domain, the receivingdevice checks information included in the frame header to selectivelyreceive a desired transmission frame or selectively decode a desiredservice from the received transmission frame.

A digital broadcasting signal transmitting device and method accordingto an exemplary embodiment of the present invention will now bedescribed.

FIG. 3 shows a block diagram of a digital broadcasting signaltransmitting device according to an exemplary embodiment of the presentinvention, and FIG. 4 shows a flowchart of a digital broadcasting signaltransmitting method according to an exemplary embodiment of the presentinvention. FIG. 3 is a partial view of a digital broadcasting signaltransmitting device according to an exemplary embodiment of the presentinvention.

As shown in FIG. 3, a transmitting device of the digital broadcastingsignal according to an exemplary embodiment of the present inventionincludes M channel encoders 310, M digital modulators 320, an allocator330, an inverse fast Fourier transform (IFFT) unit 340, a framegenerator 350, and a digital/analog (D/A) converter 360.

The channel encoder 310 channel encodes digital data (hereinafterservice data) for M services according to requirements of thecorresponding services (S410). In this instance, the channel encodingmethod includes Reed-Solomon (RS) encoding, convolution encoding,lattice encoding, turbo encoding, low density parity check (LDPC)encoding, and concatenated encoding that has concatenated at least twoencoding methods.

The M digital modulators 320 modulate channel encoded service dataoutput by the M channel encoders 310 into digital signals (S420). Here,the digital modulation method includes quadrature phase shift keying(QPSK), differential QPSK (DQPSK), 16QAM, 32QAM, 64QAM, 128QAM, and256QAM.

The allocator 330 allocates at least one sub-band and at least onesymbol to digital service data output by the M digital modulators 320(S430). Here, the allocator 330 generates information on the M servicedata, and applies the same to the frame generator 350. In this instance,information on the M services includes information on the locationcorresponding to each of the M services, information on the transmissionmode, information on the channel encoding level, information on thedigital modulation level, and information on the layer modulation level.Here, information on the M services represents information on at leastone sub-band and at least one symbol allocated to the M services.

The IFFT unit 340 converts the signal in the frequency domain for the Mservice data output by the sub-band allocator 330 into a signal in thetime domain (S440).

The frame generator 350 performs a time division multiplexing process onthe signal in the time domain output by the IFFT unit 340 intotransmission frames. That is, the frame generator 350 generates aplurality of symbol sections into a frame body of a transmission frame(S450).

The frame generator 350 generates a frame header including informationon the M services (S460). In this instance, the frame header can have astructure for synchronization of the transmission frame or can includeinformation on synchronization of the transmission frame.

The D/A converter 360 converts the transmission frame of the digitalsignal output by the frame generator 350 into an analog signal, andoutputs the analog transmission frame to the receiving device (S470).

As described, according to the digital broadcasting signal transmittingdevice and method according to the exemplary embodiment of the presentinvention, at least one sub-band and at least one symbol are allocatedto the M services. As a result, it is possible to configure a pluralityof services that are multiplexed in the frequency domain and the timedomain in the frame body of the transmission frame. Further, the frameheader including information on at least one service is configured inthe frame body, the frame header is transmitted with the signal in thetime domain, the frame header of the transmission frame is generatedafter at least one service is configured, and information on thesub-band and the symbol at which the services are located can beconfigured in the frame header.

A digital broadcasting signal receiving device and method according toan exemplary embodiment of the present invention will now be described.

FIG. 5 shows a block diagram of a digital broadcasting signal receivingdevice according to an exemplary embodiment of the present invention,and FIG. 6 shows a flowchart of a digital broadcasting signal receivingmethod according to an exemplary embodiment of the present invention.FIG. 5 is a partial view of a digital broadcasting signal receivingdevice according to an exemplary embodiment of the present invention.

As shown in FIG. 5, the digital broadcasting signal receiving deviceincludes an analog/digital (A/D) converter 510, a frame headerdeterminer 520, a fast Fourier transform (FFT) unit 530, a serviceselector 540, P digital demodulators 550, and P channel decoders 560.

The A/D converter 510 converts the received analog signal into a digitalsignal (S610).

The frame header determiner 520 senses the structure or information forindicating synchronization of the transmission frame from the digitalsignal output by the A/D converter 510, checks the location of the frameheader, and determines information configured in the frame header(S620).

In this instance, the frame header determiner 520 does not apply thecorresponding transmission frame to the FFT unit 530 when all theservices configured in the frame body of the corresponding transmissionframe are inapplicable to the receiving device.

The frame header determiner 520 applies the corresponding transmissionframe to the FFT unit 530 when at least one service configured in theframe body of the corresponding transmission frame is applicable to thereceiving device.

The FFT unit 530 converts the transmission frame in the time domain intoa signal in the frequency domain (S640).

The service selector 540 selects at least one service to be provided bythe receiving device from the transmission frame in the frequency domainoutput by the FFT unit 530 (S650). In this instance, the serviceselector 540 senses the sub-band and symbol section at which theselected service is located by using information on the serviceconfigured in the frame header. Also, the service selector 540 outputsthe selected at least one service for each service. The service selector540 will be assumed to output P services.

The P digital demodulators 550 perform a digital demodulation process onthe P services output by the service selector 540 by using informationon the modulation levels of the P services included in the frame header.

The P channel decoder 560 performs a channel decoding process on thedigitally demodulated services output by the P digital demodulators 550by using information on the channel encoding levels of the P servicesincluded in the frame header (S670).

As described, the digital broadcasting signal receiving method anddevice according to the exemplary embodiment of the present inventionreceives the transmission frame including a plurality of servicesmultiplexed in the frequency and the time domain, and uses informationconfigured in the frame header to selectively receive the service usingthe receiving device.

The above-described embodiments can be realized through a program forrealizing functions corresponding to the configuration of theembodiments or a recording medium for recording the program in additionto through the above-described device and/or method, which is easilyrealized by a person skilled in the art.

While this invention has been described in connection with what ispresently considered to be practical exemplary embodiments, it is to beunderstood that the invention is not limited to the disclosedembodiments, but, on the contrary, is intended to cover variousmodifications and equivalent arrangements included within the spirit andscope of the appended claims.

1-12. (canceled)
 13. A method of transmitting a broadcasting signal in a broadcasting signal transmitting device, the method comprising: allocating at least one sub-band and at least one symbol of a frame to each of a plurality of service data; generating a frame header including information on each of the plurality of service data; and inserting the frame header into the frame.
 14. The method of claim 13, wherein the information on the plurality of service data includes information on the sub-band and the symbol allocated to each of the plurality of service data.
 15. The method of claim 14, further comprising channel encoding each of the plurality of service data, wherein the information on each the plurality of service data further includes information on channel encoding level of each of the plurality of service data.
 16. The method of claim 14, further comprising modulating each of the plurality of service data, wherein the information on each of the plurality of service data further includes information on modulation level of each of the plurality of service data.
 17. A method of receiving a broadcasting signal in a broadcasting signal receiving device, the method comprising: determining whether to receive a frame based on a frame header of the frame; outputting at least one service data of the frame; demodulating each of the at least one service data by detecting information on modulation level of each of the at least one service data from the frame header; and channel decoding each of the at least one demodulated service data.
 18. The method of claim 17, wherein outputting at least one service data of the frame includes outputting the at least one service data by detecting a location of each of the at least one service data from the frame header.
 19. The method of claim 17, wherein channel decoding each of the at least one demodulated service data includes channel decoding each of the at least one demodulated service data by detecting information on channel encoding level of each of the at least one service data from the frame header.
 20. A method of transmitting a broadcasting signal in a broadcasting signal transmitting device, the method comprising: allocating at least one sub-band and at least one symbol of a frame to each of a plurality of service data; transforming the frame into a frame of a time domain; generating a frame header including information required for decoding the frame; and inserting the frame header into the frame of the time domain.
 21. A method of receiving a broadcasting signal in a broadcasting signal receiving device, the method comprising: receiving a frame; and decoding at least one service data included in the frame by using information included in a frame header of the frame, wherein the frame header is able to be accessed in a time domain. 